Fix screen reset not clearing cell flags

CHANGELOG.md

@@ -34,6 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Vague startup crash messages on Windows with WinPTY backend
 - Deadlock on Windows when closing Alacritty using the title bar "X" button (ConPTY backend)
 - Crash on `clear` when scrolled up in history
+- Entire screen getting underlined/stroke out when running `clear`
 
 ## 0.4.0
 

alacritty_terminal/src/term/mod.rs

@@ -1785,6 +1785,7 @@ impl<T: EventListener> ansi::Handler for Term<T> {
                 if self.mode.contains(TermMode::ALT_SCREEN) {
                     self.grid.region_mut(..).each(|c| c.reset(&template));
                 } else {
+                    let template = Cell { bg: template.bg, ..Cell::default() };
                     self.grid.clear_viewport(&template);
                 }
             },

alacritty_terminal/tests/ref.rs

@@ -62,6 +62,7 @@ ref_tests! {
     insert_blank_reset
     erase_chars_reset
     scroll_up_reset
+    clear_underline
 }
 
 fn read_u8<P>(path: P) -> Vec<u8>

alacritty_terminal/tests/ref/clear_underline/alacritty.recording

@@ -0,0 +1,5 @@
+[undeadleech@undeadlap alacritty]$ echo -e "\e[4mUNDERLINED"
+UNDERLINED
+[undeadleech@undeadlap alacritty]$ clear
+[undeadleech@undeadlap alacritty]$ exit
+exit

alacritty_terminal/tests/ref/clear_underline/config.json

@@ -0,0 +1 @@
+{"history_size":0}

alacritty_terminal/tests/ref/clear_underline/size.json

@@ -0,0 +1 @@
+{"width":662.0,"height":708.0,"cell_width":10.0,"cell_height":22.0,"padding_x":0.0,"padding_y":0.0,"dpr":1.0833333333333333}